Please explain the blend door function - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

aaberg · 09-27-2021, 07:31 AM

I have problem with only hot air on driver side and cold air on passanger side at my Camaro SS 2012 convertible.

After some reseach it seems to be a common problem with the blend door. But how comes it not same temperatur on both sides since the blend door only seems to open/close for both sides? Great if someone can explain how it works!

AlanRubin · 09-27-2021, 02:39 PM

IT is possible, that it broke, and is on an ANGLE, and has not fallen down into
the box.

REMOVE the actuator (NOT SOLENOID), it is on the driver side. When you remove it,
you will know immediately, if the blend door broke. You will not see the end
with the "+" grooves in it. Also, if you remove the actuator, and you hear
a PLOP, then it fell the rest of the way down, because it is broken.

It is a problem that GM has not been able to fix. When you use the knob to go all
the way cold, the door stops, but the motor will keep torquing on the door, and
keep torque on it, and the end twists off, and eventually breaks:

You have to stop before MAX to prevent that. Eventually, the end gets twisted off the door, and it falls.

You can take the screws out of the actuator, and turn your knob, and see
where the motor starts to move, back off a tad, and look at where the
knob is. THAT is where you stop for going cold.

GM's solution is an updated part, that is reinforced to help prevent it from
happening. I mean, the cost to replace it is enormous, so they better
had replaced it with a part that will withstand the punishment.

aaberg · 09-27-2021, 05:23 PM

Quote:

Originally Posted by AlanRubin

IT is possible, that it broke, and is on an ANGLE, and has not fallen down into the box.

Thank you for explaining in detail!

redcoats1976 · 09-28-2021, 02:34 PM

doesnt the door cycle every time the car is started or turned off?

Shan · 10-01-2021, 08:42 PM

Quote:

Originally Posted by aaberg

I have problem with only hot air on driver side and cold air on passanger side at my Camaro SS 2012 convertible.

After some reseach it seems to be a common problem with the blend door. But how comes it not same temperatur on both sides since the blend door only seems to open/close for both sides? Great if someone can explain how it works!

Yes I just had mine replaced the ac went out they had to take the windshield out & remove dashboard to get to it! The dealership wanted $2,500 to fix it thank God I had an extended warranty I only ended up paying $100 deductible

AlanRubin · 10-02-2021, 12:50 AM

Quote:

Originally Posted by redcoats1976

doesnt the door cycle every time the car is started or turned off?

Yes. But, if the end sheered off at the actuator, and is still hanging on an angle, it can happen. They mostly fall inside, and lay flat for 50/50 blend.

Fred 6528 · 10-02-2021, 04:09 AM

YouTube has several videos on how to fix without removing the windshield

redcoats1976 · 10-02-2021, 07:59 AM

i think i would be putting a valve in the water hoses to the heater before spending another 2 grand...

Moto-Mojo · 10-02-2021, 08:33 AM

I think the function of the blend door is to cause the complete removal of the dashboard and create all new rattles - as well as windshield replacement. That and the removal of a sizable chunk of your savings.

0stones0 · 10-02-2021, 08:46 AM

Quote:

Originally Posted by redcoats1976

i think i would be putting a valve in the water hoses to the heater before spending another 2 grand...

Quote:

Originally Posted by Moto-Mojo

I think the function of the blend door is to cause the complete removal of the dashboard and create all new rattles - as well as windshield replacement. That and the removal of a sizable chunk of your savings.

+1

redcoats1976 · 10-02-2021, 12:05 PM

i had to spend 2 grand for the new evaporator she needed last summer,no way around that.but my dealer was able to remove the windshield and dash with no breakage or rattles afterwards,so theres that...

Wizard1183 · 10-02-2021, 04:56 PM

Quote:

Originally Posted by redcoats1976

i think i would be putting a valve in the water hoses to the heater before spending another 2 grand...

Trying to find the thread on that but to no avail. Explain it again please

AlanRubin · 10-03-2021, 12:36 AM

Quote:

Originally Posted by Wizard1183

Trying to find the thread on that but to no avail. Explain it again please

Basically, you are going to install a valve in the hose TO the heater core.
Not on the FROM, you do not want the pressure in the heater core with
no exit, so it should go on the IN hose.

You can also install a bypass valve, so it just loops through the valve
instead of the core being the loop.

You can look up HEATER CORE BYPASS on yahoo or google...

Wizard1183 · 10-03-2021, 06:53 AM

Quote:

Originally Posted by AlanRubin

Basically, you are going to install a valve in the hose TO the heater core.
Not on the FROM, you do not want the pressure in the heater core with
no exit, so it should go on the IN hose.

You can also install a bypass valve, so it just loops through the valve
instead of the core being the loop.

You can look up HEATER CORE BYPASS on yahoo or google...

Thanks man

09-27-2021, 07:31 AM	#1
aaberg Drives: 1997 30th conv & 2012 45th conv Join Date: Jul 2017 Location: Sweden Posts: 122 View My Garage	Please explain the blend door function I have problem with only hot air on driver side and cold air on passanger side at my Camaro SS 2012 convertible. After some reseach it seems to be a common problem with the blend door. But how comes it not same temperatur on both sides since the blend door only seems to open/close for both sides? Great if someone can explain how it works!

09-27-2021, 02:39 PM	#2
AlanRubin Banned Drives: 2010 LS Join Date: Feb 2021 Location: Pgh Posts: 411	IT is possible, that it broke, and is on an ANGLE, and has not fallen down into the box. REMOVE the actuator (NOT SOLENOID), it is on the driver side. When you remove it, you will know immediately, if the blend door broke. You will not see the end with the "+" grooves in it. Also, if you remove the actuator, and you hear a PLOP, then it fell the rest of the way down, because it is broken. It is a problem that GM has not been able to fix. When you use the knob to go all the way cold, the door stops, but the motor will keep torquing on the door, and keep torque on it, and the end twists off, and eventually breaks: You have to stop before MAX to prevent that. Eventually, the end gets twisted off the door, and it falls. You can take the screws out of the actuator, and turn your knob, and see where the motor starts to move, back off a tad, and look at where the knob is. THAT is where you stop for going cold. GM's solution is an updated part, that is reinforced to help prevent it from happening. I mean, the cost to replace it is enormous, so they better had replaced it with a part that will withstand the punishment. Last edited by AlanRubin; 09-27-2021 at 02:49 PM.

10-02-2021, 08:33 AM	#9
Moto-Mojo Fast Cars and Old Guitars Drives: 2015 2SS RS (L99, baby!) Join Date: Apr 2012 Location: N. CA Posts: 3,974	I think the function of the blend door is to cause the complete removal of the dashboard and create all new rattles - as well as windshield replacement. That and the removal of a sizable chunk of your savings. __________________ “I don’t want to belong to any club that would have me as a member.” - Groucho Marx

09-28-2021, 02:34 PM	#4
redcoats1976 Drives: LT W/2LT,blue metallic Join Date: Jul 2016 Location: central florida Posts: 4,915	doesnt the door cycle every time the car is started or turned off?

10-02-2021, 04:09 AM	#7
Fred 6528 Drives: 2011 ss Join Date: May 2013 Location: va Posts: 983	YouTube has several videos on how to fix without removing the windshield

10-02-2021, 07:59 AM	#8
redcoats1976 Drives: LT W/2LT,blue metallic Join Date: Jul 2016 Location: central florida Posts: 4,915	i think i would be putting a valve in the water hoses to the heater before spending another 2 grand...

10-02-2021, 12:05 PM	#11
redcoats1976 Drives: LT W/2LT,blue metallic Join Date: Jul 2016 Location: central florida Posts: 4,915	i had to spend 2 grand for the new evaporator she needed last summer,no way around that.but my dealer was able to remove the windshield and dash with no breakage or rattles afterwards,so theres that...